Safety lamp plug and socket.



I H. G. JONES & G. M. WEEKS.

, SAFETY LAMP PLUG AND SOCKET. APPLIOATION FILED Jnmv, 191a. v 1,062,920, Patented May 27, 1913 UNITED STATES PATENT OFFICE. I

HOWARD o. JonEsAND CHAR-LES M. WEEKS,. or sorrnnvrmn, massscnusnrrs,

. SAFETY LAMP rLuG am) sooner.

noeaeao.

Specification of Letters Patent. I Patented luay 27, 1913.

useful Improvement in Safety Lamp Plugs.

and Sockets, of which the following is a specification.

Our invention relates to'safety lamp plugs and sockets for incandescent lamps and its object is'to provide a device of this character which will render impossible the i the contact cups 7 and 12 which is soldered to the threaded con-i ducting members 3 and 5, said conductors unauthorized removal of the lamps.

Our invention will be describedin con nection with the drawings which accompany and form a part of this specification and illustrate one embodiment thereof.

In the drawings, Figure 1 is a longitudinal section of our improved lamp plug and socket showing a lamp fixed in the socket. Fig. 2 is a section taken on the line 2-2 of Fig. 1. Fig. 3 is a plan View; Fig. 4 is a front elevation; Figs. 5, 6 and 7 are end views ofthe lamp-retaining screw, and Fig. 8 is a longitudinal section of the screw shown in Fig.7.

In the particular drawings selected for more fully disclosing our invention, 1 represents a body of insulating material having which is secured, as by threading, the interiorly-threaded conducting member 5. The threaded member 3 is arranged to be screwed into a wall-socket chandeliersocket, or the like, and the member 5 is arranged to receive the threaded cap 6 of a lamp as shown. 5

The upper flanged portion of the member 3 secures the insulating cap 8 of porcelain or the like to. the plug member and the contact cap 7 is secured to the porcelain cap 8 by means of lugs which pass through open-- ings in the latter. A porcelain cap 10 is held against the upper wall of the socket by the conductor 11, which is soldered to 9 and by the conductor through holes in the cap 10 as passing It will be understood of course that shown.

- the details above described may be suitably varied and that it is essential only to provide threaded conducting members for attaching the plug to a wall socket or the. like and for receiving the lamp respectively; to electrically connect these threaded members; and to provide two conducting caps for .making contactrespectively With one of the terminals of they wall socket oiffthe like and .one of the terminals of. the lain and to connect said conducting capsfgectrically. In order to prevent the 'unautlibrized removal of'the' plug from the'soclte in which the same is screwed, weaprovide as shown in the present instance a pointed screw 13,

theyhead of which may be slotted in the -usual manner and which is arranged to pass diagonally up through the plug so that its point will enter the threaded member of the socket in which the plug is screwed.

In order to prevent the unauthorizedremoval of a lamp from its socket, we provide, as shown, a pointed screw-l5 extending diagonally downward and so arranged that its point enters the cap of the lamp. The head of the screw 15 is provided with an aperture which of course may have any appropriate shape, such as the octagon'shown at 17, the

triangle shown at 17 or the partly'circular and partly angular shape shown at 17 A person who is authorized to remove the lamps from a socket will be provided with a key shaped to correspond with the aperture in the head of the screw 15, so that when such key is employed the screw maybe withdrawn and the lamp removed.

It is convenient to provide the body portion with a front enlargement suchas that shown at 14, provided with an opening 15 for receiving the end of a screw-driver or key to insert or remove the screws 13 and 15 respectively. It will be noted that the head of the screw 15 projects beyond the head of the screw 13, so that the latter cannot be removed so long as the former is in operative posit-ion. However, it will be understood that the head of the screw 13 may also be provided with an aperture corresponding to that in the head of the screw 15, and that in such case both screws will be operated by a key fitting into the apertures in the heads thereof.

It will be understood that various modifications may be made in the details above described withoutdeparting from the spirit of our invention.

We claim:

1. In a device of the character described, an insulating body having a plug portion,

an eXteriorly-tln'eaded conducting member secured thereto and a pointed screw passing diagonally through said plug portion and so arranged that its pointwill pene rate a socket receiving said plug.

2. in a device of the character described,

an insulating body having a plug portion at one end, a socket portion at the other end and a central enlargement between said portions, said central enlargement being provided with a key-hole, plug-locking means accessible from said he -hole and lamp-l0cking means also accessible from said key-hole, the end of said lamp-locking means being provided with an aperture of definite shape arranged to receive a correspondinglyshaped key and said end when in looking position projecting'beyond the end of said plug-locking means.

3. In a device of the character described, an insulating body having a plug portion at one end, a socket portion at the other end and a central enlargement between said portions, said central enlargement being provided with a key-hole, plug-locking means accessible from said key-hole and-lampdock mg means also accessible fromsa1dkey-hole,-'

the ends of said plug-locking means and 5. In a device of the character described,

an insulating body having a plug 'p'ortion at one end, a socket tions, said central enlargement being provided with a key-hole, key-controlled pluglocking means accessible from said key-hole and key-controlled lamp-locking means also accessible from said key-hole.

In testimony whereof, We have hereunto subscribed our names this 15th day of J anuary, 1913.

HOWARD c. JoNEs. CHARLES M. WEEKS.

Witnesses;

GEO. K. WoonwoR'rH, E. B. TOMLINSON.

portion at the other endand a central enlargement between said por- 

